Safety instructions
Residual hazards
2
12
Lenze • BA 12.0032 • 4.0
2.4 Residual hazards
Protection of persons
•Riskofburnst!
– Hot surfaces up to 140 °C during operation! Provide protection against contact.
• High-frequency voltages can be capacitively transferred to the motor housing
through the inverter supply.
– Earth motor housing carefully.
• Risk of injury due to rotating shaft!
– Before working on the motor ensure that the motor is at standstill.
• Danger of unintentional starting or electrical shocks!
– Connections must only be made when the equipment is deenergised and the
motor is at standstill.
– Installed brakes are no fail-safe brakes.
• Dangerous voltages at the power terminals, even if the plug is removed: residual
voltage >60 V!
Motor protection
• Installed thermal detectors do not offer full protection to the machine.
– If required, limit the maximum current, parameterise the inverter so that it will
be switched off after some seconds of operation with I > I
N
, especially if there is
the danger of blocking.
– Installed overload protection does not prevent an overload under any
conditions.
• Installed brakes are no fail-safe brakes.
– The torque can be reduced due to disruptive factors that cannot be influenced,
e.g. by ingressing oil due to a defect shaft sealing ring on the A side.
• Fuses are no motor protection.
– Use current-dependent motor protection switches at an average operating
frequency.
– Use installed thermal detectors at a high operating frequency.
• Excessive torques lead to a break of the motor shaft or demagnetisation.
– The maximum torques according to catalogue must not be exceeded.
• Lateral forces from the motor shaft may occur.
– Align shafts of motor and driving machine exactly to each other.
• If deviations from normal operation occur, e.g. increased temperature, noise,
vibration, determine the cause and, if necessary, contact the manufacturer. If in
doubt, switch off the motor.
• Design with plug:
– Never disconnect plug when energised! Otherwise, the plug can be destroyed.
– Switch off power supply and inhibit controller prior to disconnecting the plug.
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